Filtering element and new method for its manufacture
United States Patent 2271662

Inventors:
Alexis, Rubissow George
Publication Date:
02/03/1942
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Assignee:
Alexis, Rubissow George
Primary Class:
140/7
Other Classes:
55/520, 139/425R, 29/896.620, 55/525, 428/594, 140/112, 428/596, 210/499, 239/428.500, 428/593, 140/3R
International Classes:
B01D39/10; B07B1/46; B21F27/18; B21F45/00; B21F27/00